body{
	background: black;
	margin: 0;
	padding: 0;
}

main{
	margin: -184px 0 0 -279px;
	background-color: white;
	height: 500px;
	width: 500px;
	position: absolute;
	left: 50%;
	top: 50%;

}

#btn{
	background: blue;
	opacity: 0.7;
	border-radius: 15px 15px;
	color: white;
	width: 83px;
	height: 40px;
}

.kuai{
	margin:69px 0 45px 25px;
}

#tips{
	margin: 2px 0 0 68px;
	opacity: 0.7;
}

label{
	font-size: 30px;
}
#b1{
	height: 30px;
	width: 300px;
	border-radius: 10px 10px;
}

